Stihl 064 or 066

[cottonwood1]

Hello All,
I have had for a few years what I thought was an 064. The top engine shroud does cover the recoil starter all the way and there is a little gap. I have always thought the saw was close to my old 394xp in weight, but never really paid attention to it. I needed to do some work on it and was taking it apart and now I am thinking it may be a 066 with a 064 cover on it. It has a single keyway flywheel not poly, I tried the stick in the cylinder and then measured it and it comes up at 54mm which would be the 066. Even though the cylinder is the 54 that still could have been someone putting a bigger cylinder on the saw. It doesn't appear that the cylinder bolt holes were enlarge however which would indicate that it is a stock 066. No decompression valve so it would be a flat top 066 if it is that. Any other things to check to ensure it actually is a 066 instead of a 064? Need to replace oil pump, worm gears and possible crank seals so want to narrow down what it is for sure. Got the saw super cheap a few years back and kind of exciting to see it may actually be a bigger saw then I always thought it was. Thanks to all.

 

[BuckthornBonnie]

The oil pump will tell ya... as will some other differences once you get into it a bit more.

 

[ironman_gq]

Is it a factory Mahle cylinder? Pretty sure the seals are the same, oil pump is different, worm gear is likely the same though.

 

[BuckthornBonnie]

064 flywheel seal would be different from later 066s and 660s.

 

[blsnelling]

Flywheel and recoil housing is much wider on the 066.

 

[blsnelling]

064 flywheel seal would be different from later 066s and 660s.

But the same as an early 066.

 

[BuckthornBonnie]

But the same as an early 066.

Yep

 

[Laslabjohn]

Also 064 has this indention rite above recoil housing.

 

[Wood Doctor]

Take the carb cover off. If what you see is this (lower Pic), you have an 064:

If not, you have an 066. Notice how much stronger the 064 is built. That is one reason why I have never sold mine.

 

[dustinwilt68]

The early 066 would look identical to the 064 if you take the carb cover off, they share the same tanks and filter setups, as laslajohn said the case identification is the easiest way to tell, just remove the starter cover.

 

[L34]

064 has hose from oil pump to bar.066 has internal passage from pump to bar.

 

[Wood Doctor]

The early 066 would look identical to the 064 if you take the carb cover off, they share the same tanks and filter setups, as laslajohn said the case identification is the easiest way to tell, just remove the starter cover.

You have to wonder what OP actually sees when he removes his carb cover. To my knowledge, the 064 was never equipped with a decompression valve, but I suppose the early 066 may not have had one either.

 

[Chainsaw Jim]

The only way you'll know for sure whether this saw started off as an 064 is by the oil pump.

 

[cottonwood1]

Finally got the clutch off. I have the air cleaner as shown but some 066 had that too I thought I also have the indent as shown. The oil pump number is 1122 647 0401. I am not totally sure of the first four numbers as they are worn down but I think it is 1122.

 

[dustinwilt68]

If it has that indent, it is a 064, you have to take the starter cover off to see the indent.

 

[Chainsaw Jim]

Finally got the clutch off. I have the air cleaner as shown but some 066 had that too I thought I also have the indent as shown. The oil pump number is 1122 647 0401. I am not totally sure of the first four numbers as they are worn down but I think it is 1122.

064



066

 

[cottonwood1]

It is a 064 must just have put on the 066 pull cover. The pump is similar to the 064 but I can’t find the correct part number that matches. Can you test a pump to ensure it is bad and isn’t just a block or the worm gear?

 

[cottonwood1]

My pump has three tabs that are on it other wise matches the 064 pic. Can’t post a pic otherwise I would to help identify it.

 

[BuckthornBonnie]

Oil pump is 064 vs. 066 improvement in my opinion. I like the case design of the 066... good design by Stihl.

The oil pump will tell ya... as will some other differences once you get into it a bit more.